CN115174329A

CN115174329A - Method, apparatus, storage medium and program product for modulating and demodulating a signal

Info

Publication number: CN115174329A
Application number: CN202110369353.9A
Authority: CN
Inventors: 刘辰辰; 淦明; 陆雨昕
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2021-04-06
Filing date: 2021-04-06
Publication date: 2022-10-11
Also published as: CN116938660A; WO2022214000A1; US20240031212A1; EP4307627A1

Abstract

Embodiments of the present disclosure provide methods, apparatuses, storage media, and program products for modulating and demodulating signals. In the method of modulating a signal proposed in the first aspect of the present disclosure, a transmitting device modulates a bit sequence onto a plurality of subcarriers using binary phase shift keying, BPSK, constellation point mapping, dual carrier modulation, DCM, and repetition of the operation DUP, wherein the plurality of subcarriers includes a first group of subcarriers and a second group of subcarriers. The transmitting device then changes the phase of the first data carried by the first set of subcarriers by 90 degrees or minus 90 degrees and further generates a modulated signal based on the phase-changed first data carried by the first set of subcarriers and the second data carried by the second set of subcarriers. Based on the mode, the modulation signal can utilize the I path and the Q path channel at the same time when being transmitted, thereby enhancing the diversity gain of the system.

Description

Method, apparatus, storage medium and program product for modulating and demodulating a signal

Technical Field

Embodiments of the present disclosure relate generally to the field of information communication, and more particularly, to methods, apparatuses, storage media, and program products for modulating and demodulating signals.

Background

Orthogonal Frequency Division Multiplexing (OFDM) is a multi-carrier modulation technique, and has the advantages of high spectrum efficiency, multipath fading resistance, and the like, but also has the disadvantage of large Peak to Average Power Ratio (PAPR). The addition of multiple subcarriers in OFDM results in a large peak signal, and therefore requires a large linear dynamic range for the high power amplifier, which increases the cost of the high power amplifier and reduces the efficiency of the high power amplifier. If the peak value exceeds the linear dynamic range of the high-power amplifier, the in-band distortion and out-of-band dispersion are caused, so that the reduction of the PAPR is a key technology of the OFDM system and has great significance. In the IEEE 802.11be standard, a combination of repetition mode (DUP mode) and DCM (Dual Carrier Modulation) techniques is used to reduce the high PAPR problem caused by frequency domain repetition.

Disclosure of Invention

Embodiments of the present disclosure provide a scheme for modulating and demodulating a signal.

In a first aspect of the present disclosure, a method of modulating a signal is provided. The method comprises the following steps: modulating a bit sequence onto a plurality of subcarriers by using Binary Phase Shift Keying (BPSK) constellation point mapping, binary carrier modulation (DCM) and repeated operation (DUP), wherein the plurality of subcarriers comprise a first group of subcarriers and a second group of subcarriers; changing the phase of first data carried by a first group of subcarriers by a predetermined angle, the predetermined angle being 90 degrees or minus 90 degrees; and generating a modulated signal based on the phase-shifted first data carried by the first group of subcarriers and the second data carried by the second group of subcarriers.

By changing the phase of the first data carried by the first group of subcarriers, the embodiment of the disclosure can enable the data carried by the subcarriers to simultaneously include real values and virtual values, thereby simultaneously utilizing an I-path channel and a Q-path channel when sending signals, and further enhancing the diversity benefit of the system.

In some embodiments of the first aspect, the first set of subcarriers comprises odd numbered subcarriers of the plurality of subcarriers and the second set of subcarriers comprises even numbered subcarriers of the plurality of subcarriers.

In some embodiments of the first aspect, wherein the first set of subcarriers comprises even numbered subcarriers of the plurality of subcarriers, the second set of subcarriers comprises odd numbered subcarriers of the plurality of subcarriers.

By changing the phase of data carried by subcarriers at odd or even positions in the plurality of groups of subcarriers, the I-path channel and the Q-path channel can be utilized more uniformly.

In a second aspect of the disclosure, a method of demodulating a signal is provided. The method comprises the following steps: acquiring first data carried on a first group of subcarriers and second data carried on a second group of subcarriers in a plurality of subcarriers; changing the phase of the first data by a predetermined angle, the predetermined angle being 90 degrees or minus 90 degrees; and determining a bit sequence based on the phase-changed first data and second data.

In this way, the embodiments of the present disclosure can effectively demodulate a bit sequence from a received modulated signal.

In some embodiments of the second aspect, the first group of subcarriers comprises odd numbered subcarriers of the plurality of subcarriers and the second group of subcarriers comprises even numbered subcarriers of the plurality of subcarriers.

In some embodiments of the second aspect, wherein the first set of subcarriers comprises even numbered subcarriers of the plurality of subcarriers, the second set of subcarriers comprises odd numbered subcarriers of the plurality of subcarriers.

In a third aspect of the disclosure, a method of modulating a signal is provided. The method comprises the following steps: determining at least one first frequency domain sequence corresponding to the bit sequence by using Quadrature Phase Shift Keying (QPSK) constellation point mapping; determining at least one second frequency-domain sequence based on a complex transform of the at least one first frequency-domain sequence; determining data carried by a plurality of subcarriers based on at least one first frequency-domain sequence and at least one second frequency-domain sequence using at least one of dual carrier modulation, DCM, and repetition operation, DUP; and generating a modulated signal based on the data carried by the plurality of subcarriers.

In this way, the embodiments of the present disclosure can provide resource utilization efficiency and can provide diversity benefits of the system.

In some embodiments of the third aspect, the complex transform comprises at least one of: conjugate transformation; exchanging the imaginary part and the real part; or an inversion operation.

In some embodiments of the third aspect, the at least one copying process comprises a first copying process that causes values of odd or even positions in the frequency domain sequence to be copied to be inverted as the copied frequency domain sequence.

In some embodiments of the third aspect, the at least one copying process comprises a second copying process that causes values of a first half or a second half of the frequency-domain sequence to be copied to be inverted as the copied frequency-domain sequence.

In a fourth aspect of the present disclosure, a method of demodulating a signal is provided. The method comprises the following steps: acquiring data carried by a plurality of groups of subcarriers, wherein the plurality of groups of subcarriers comprise at least four groups of subcarriers used for carrying the same information; and determining a bit sequence by utilizing Quadrature Phase Shift Keying (QPSK) constellation point demapping based on data carried by at least one group of subcarriers in the plurality of groups of subcarriers.

In some embodiments of the fourth aspect, the plurality of groups of subcarriers comprises eight groups of subcarriers.

In some embodiments of the fourth aspect, determining the bit sequence corresponding to the received signal using quadrature phase shift keying, QPSK constellation point demapping comprises: performing a complex transformation on data carried by at least one group of subcarriers; determining an intermediate sequence corresponding to the complex transformed data by performing QPSK constellation point demapping on the complex transformed data; and determining a bit sequence based at least on the intermediate sequence.

In some embodiments of the fourth aspect, the inverse complex transform comprises at least one of: conjugate transformation; exchange of imaginary and real parts; or an inversion operation.

In a fifth aspect of the present disclosure, a transmitting device is provided. The transmission apparatus includes: a carrier modulation module configured to modulate a bit sequence onto a plurality of subcarriers using Binary Phase Shift Keying (BPSK) constellation point mapping, dual Carrier Modulation (DCM), and repetition of operation (DUP), the plurality of subcarriers including a first group of subcarriers and a second group of subcarriers; a phase adjustment module configured to change a phase of first data carried by the first group of subcarriers by a predetermined angle, the predetermined angle being 90 degrees or minus 90 degrees; and a first signal generation module configured to generate a modulated signal based on the phase-changed first data carried by the first set of subcarriers and the second data carried by the second set of subcarriers.

In some embodiments of the fifth aspect, the first set of subcarriers comprises odd numbered subcarriers of the plurality of subcarriers and the second set of subcarriers comprises even numbered subcarriers of the plurality of subcarriers.

In some embodiments of the fifth aspect, wherein the first set of subcarriers comprises even numbered subcarriers of the plurality of subcarriers and the second set of subcarriers comprises odd numbered subcarriers of the plurality of subcarriers.

In a sixth aspect of the present disclosure, a receiving apparatus is provided. The receiving apparatus includes: a first data acquisition module configured to determine first data carried on a first set of subcarriers and second data carried on a second set of subcarriers of a plurality of subcarriers; a phase inversion adjustment module configured to change a phase of the first data by a predetermined angle, the predetermined angle being 90 degrees or minus 90 degrees; and a first sequence determination module configured to determine a bit sequence based on the phase-changed first data and the second data.

In some embodiments of the sixth aspect, the first set of subcarriers comprises odd numbered subcarriers of the plurality of subcarriers and the second set of subcarriers comprises even numbered subcarriers of the plurality of subcarriers.

In some embodiments of the sixth aspect, the first set of subcarriers comprises even numbered subcarriers of the plurality of subcarriers and the second set of subcarriers comprises odd numbered subcarriers of the plurality of subcarriers.

In a seventh aspect of the present disclosure, a transmitting device is provided. The transmission apparatus includes: a QPSK mapping module configured to determine at least one first frequency domain sequence corresponding to the bit sequence using Quadrature Phase Shift Keying (QPSK) constellation point mapping; a transform module configured to determine at least one second frequency-domain sequence based on a complex transform of the at least one first frequency-domain sequence; a replication module configured to determine data carried by a plurality of subcarriers based on at least one of the at least one first frequency-domain sequence and the at least one second frequency-domain sequence with at least one of dual carrier modulation, DCM, and repetition operation, DUP; and a second signal generation module configured to generate a modulated signal based on data carried by the plurality of subcarriers.

In some embodiments of the seventh aspect, the complex transform comprises at least one of: conjugate transformation; exchanging the imaginary part and the real part; or an inversion operation.

In some embodiments of the seventh aspect, the at least one copying process comprises a first copying process that causes values of odd or even positions in the frequency domain sequence to be copied to be inverted as the copied frequency domain sequence.

In some embodiments of the seventh aspect, the at least one copying process includes a second copying process that causes values of a first half or a second half of the frequency domain sequence to be copied to be inverted as the copied frequency domain sequence.

In an eighth aspect of the present disclosure, a receiving apparatus is provided. The receiving apparatus includes: a second data acquisition module configured to acquire data carried by a plurality of groups of subcarriers, the plurality of groups of subcarriers including at least four groups of subcarriers for carrying the same information; and a second sequence determination module configured to determine a bit sequence by utilizing Quadrature Phase Shift Keying (QPSK) constellation point demapping based on data carried by at least one group of subcarriers of the plurality of groups of subcarriers.

In some embodiments of the eighth aspect, the plurality of groups of subcarriers comprises eight groups of subcarriers.

In some embodiments of the eighth aspect, the second sequence determination module is further configured to: performing a complex transformation on data carried by at least one set of subcarriers; determining an intermediate sequence corresponding to the complex transformed data by performing QPSK constellation point demapping on the complex transformed data; and determining a bit sequence based at least on the intermediate sequence.

In some embodiments of the eighth aspect, the inverse complex transform comprises at least one of: conjugate transformation; exchange of imaginary and real parts; or an inversion operation.

In a ninth aspect of the disclosure, a transmitting device, a processor and a memory are provided. The memory is for storing instructions for execution by the processor, which when executed by the processor cause the processor to perform the method described according to the first or third aspect.

In a tenth aspect of the present disclosure, a receiving apparatus is provided. The receiving apparatus includes: a processor and a memory. The memory is for storing instructions for execution by the processor, which when executed by the processor, cause the processor to perform the method described according to the second or fourth aspect.

In an eleventh aspect of the present disclosure, there is provided a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the method of the first, second, third or fourth aspect.

In a twelfth aspect of the disclosure, a computer program product is provided, the computer program product comprising computer executable instructions that, when executed by a processor, implement the method described in the first, second, third or fourth aspect.

This summary is provided to introduce a selection of concepts in a simplified form that are further described below in the detailed description. This summary is not intended to identify key features or essential features of the disclosure, nor is it intended to be used to limit the scope of the disclosure.

Drawings

The above and other features, advantages and aspects of embodiments of the present disclosure will become more apparent upon consideration of the following detailed description, taken in conjunction with the accompanying drawings. In the drawings, like or similar reference characters designate like or similar elements, and wherein:

FIG. 1 illustrates a schematic block diagram of a communication environment in which embodiments of the present disclosure may be implemented;

FIG. 2 shows a schematic diagram of an example process of conventional modulating a signal;

fig. 3 illustrates a flow diagram of an example process of modulating a signal, in accordance with some embodiments of the present disclosure;

fig. 4 illustrates a CDF simulation comparison diagram of PAPR in accordance with some embodiments of the disclosure;

fig. 5 illustrates a flow diagram of an example process of demodulating a signal, in accordance with some embodiments of the present disclosure;

FIG. 6 shows a flow diagram of an example process of modulating a signal according to further embodiments of the present disclosure;

FIG. 7 shows a CDF simulation comparison diagram of PAPR according to further embodiments of the present disclosure

FIG. 8 shows a flowchart of an example process of demodulating a signal, according to further embodiments of the present disclosure;

fig. 9 shows a schematic block diagram of a transmitting device in accordance with some embodiments of the present disclosure;

figure 10 shows a schematic block diagram of a receiving device in accordance with some embodiments of the present disclosure;

FIG. 11 shows a schematic block diagram of a transmitting device in accordance with further embodiments of the present disclosure;

FIG. 12 shows a schematic block diagram of a receiving device in accordance with further embodiments of the present disclosure; and

fig. 13 illustrates a simplified block diagram of an example device suitable for implementing some embodiments of the present disclosure.

Detailed Description

Embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While certain embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be construed as limited to the embodiments set forth herein, but rather are provided for a more complete and thorough understanding of the present disclosure. It should be understood that the drawings and embodiments of the disclosure are for illustration purposes only and are not intended to limit the scope of the disclosure.

In describing embodiments of the present disclosure, the terms "include" and its derivatives should be interpreted as being inclusive, i.e., "including but not limited to. The term "based on" should be understood as "based at least in part on". The term "one embodiment" or "the embodiment" should be understood as "at least one embodiment". The terms "first," "second," and the like may refer to different or the same objects. Other explicit and implicit definitions are also possible below.

Example communication Environment

IEEE 802.11 is one of the current mainstream wireless access standards, and has gained extremely wide commercial use in recent decades. Fig. 1 illustrates a schematic diagram of a communication environment 100 in which embodiments of the present disclosure may be implemented. As shown in fig. 1, the communication environment 100 may include one or more access points AP 110 and one or more station STAs 120.

In the communications environment 100, the access point AP 110 may access the internet, either through wires or wirelessly, and may be associated with one or more station STAs 120. Data communication between access point AP 110 and an associated station STA120, between different access points 110, and between different station STAs 120 may be via a predetermined protocol (e.g., IEEE 802.11 protocol). In some embodiments, the access point AP 100 may be, for example, a wireless router. Station STA120 may include a wireless mobile device, examples of which include but are not limited to: smart phones, notebook computers, tablet computers, smart wearable devices or vehicle-mounted mobile devices, and the like.

In the process of communication between different devices, data to be transmitted can be modulated into a modulation signal by a sending device and sent to a corresponding receiving device. Dual Carrier Modulation (DCM) is introduced in IEEE 802.11ax standard, and the same information is modulated on a pair of subcarriers, thereby improving the anti-interference capability. DCM dual carrier modulation refers to the repeated transmission of a signal on two sub-carriers at the same time, thereby increasing the effect of diversity.

In the IEEE 802.11be standard, the 6G spectrum is also used openly. However, current regulations set strict power density limits for indoor devices operating in the 6G frequency band, which results in that the transmission distance of indoor WiFi devices is greatly limited. In order to improve the indoor propagation distance limitation, the IEEE 802.11be standard adopts a technical combination of a repetition mode (DUP mode) and DCM.

Illustratively, for the DUP mode at 80MHz bandwidth, its 40MHz lower bandwidth (corresponding to 484 resource units RUs) and 40MHz higher bandwidth (484 RUs) transmit the same information. For DUP mode at 160MHz bandwidth, its 80MHz lower bandwidth (RU 996) and 80MHz higher bandwidth (RU 996) transmit the same content. For DUP mode at 320MHz bandwidth, its lower 160MHz (RU 2 x 996) and upper 160MHz (RU 2 x 996) transmit the same content. According to the current IEEE 802.11be standard, the DUP mode is only used when DCM and Binary Phase Shift Keying BPSK (Binary Phase Shift Keying) modes are enabled simultaneously.

Fig. 2 illustrates a schematic diagram of an example process 200 for modulating a signal. As shown in fig. 2, according to the conventional IEEE 802.11be standard, in the DUP mode, first, in step 202, data to be modulated may be converted into a corresponding frequency domain sequence via BPSK constellation point mapping. The frequency domain sequences may then be mapped to a corresponding set of subcarriers to determine the data carried by the set of subcarriers.

In step 204, the data carried by another set of subcarriers is determined based on the DCM modulation. For example, the other frequency-domain sequence may be determined based on the original frequency-domain sequence, where the correspondence between the elements in the other frequency-domain sequence and the elements in the original frequency-domain sequence may be expressed as:

wherein, d _k Representing the kth element in the original frequency domain sequence determined by BPSK mapping,

representing the k-th element, N, in another frequency-domain sequence _sd Representing numbers contained within resource blocksDepending on the number of subcarriers. For example, in 160MHz bandwidth mode as an example, N _sd At 490, i.e. the data carried by the second group 490 of data sub-carriers is determined by negating the data carried by the data sub-carriers at even positions in the first group of data sub-carriers.

In step 206, data carried by the data subcarriers contained by another resource block is determined based on the DUP repetition operation. Specifically, the process may be represented as:

wherein, d _k,1 Indicating the data carried by the kth data sub-carrier in the first resource block,

indicating the data carried by the kth data sub-carrier in the second resource block. Taking the 160MHz bandwidth mode as an example, the data carried by the third group 490 data subcarriers is determined by negating the data carried by the first group 490 data subcarriers, and the data carried by the fourth group 490 data subcarriers is a direct copy of the data carried by the second group 490 data subcarriers.

In step 208, the frequency domain data may be converted into frequency domain data based on Inverse Discrete Fourier Transform (IDFT), thereby generating a modulated signal.

However, in the conventional signal modulation process, BPSK constellation point mapping always converts one bit of data to be modulated into 1 or-1. Such data will have only a real part, which will result in that only one of the I path or the Q path will be available when transmitting the modulated signal, thereby not fully exploiting the diversity gain.

First mode of realisation of the present disclosure

According to an example embodiment of the present disclosure, an improved scheme of modulating and demodulating a signal is provided. Specifically, in modulating a signal, a transmitting device modulates a bit sequence onto a plurality of subcarriers using Binary Phase Shift Keying (BPSK) constellation point mapping, dual Carrier Modulation (DCM), and repetition of a DUP operation, wherein the plurality of subcarriers includes a first group of subcarriers and a second group of subcarriers. The transmitting device then causes the first data carried by the first set of subcarriers to be 90 degrees or minus 90 degrees in phase and further generates a modulated signal based on the phase-shifted first data carried by the first set of subcarriers and the second data carried by the second set of subcarriers. Based on the mode, the modulation signal can utilize the I path and the Q path channel at the same time when being transmitted, thereby enhancing the diversity gain of the system.

A process of modulating a signal according to an embodiment of the present disclosure will be described below with reference to fig. 3. Fig. 3 shows a flowchart of an example process 300 of modulating a signal according to an embodiment of this disclosure. It should be understood that process 300 may be performed by a suitable transmitting device, examples of which include, but are not limited to, access point AP 110 or station STA120 illustrated in fig. 1.

As shown in fig. 3, at step 302, the transmitting device modulates a bit sequence onto a plurality of subcarriers, including a first set of subcarriers and a second set of subcarriers, using Binary Phase Shift Keying (BPSK) constellation point mapping, dual Carrier Modulation (DCM), and repetition of the operation DUP.

Taking the 160MHz bandwidth mode as an example, the bandwidth mode corresponds to 2 RUs 996 (also known as 996 RUs, 996-tones), where each RU 996 consists of 996 subcarriers, including 980 data subcarriers and 16 pilot subcarriers. First, 490 bits may be selected from a bit sequence to be modulated and BPSK constellation point mapping is performed thereon, thereby obtaining a frequency domain sequence of length 490.

Further, the transmitting apparatus may DCM-modulate the frequency domain sequence (also referred to as a base frequency domain sequence for convenience of description) to generate another frequency domain sequence (also referred to as a replica frequency domain sequence for convenience of description). Specifically, the correspondence between the elements in the replica frequency domain sequence and the elements in the base frequency domain sequence may be expressed as:

d′ _k+490 ＝d _k ×(-1) ^k (3)

wherein d is _k Representing the kth element, d 'in the base frequency-domain sequence determined by BPSK mapping' _k+490 Representing the corresponding kth element in the replica frequency domain sequence.

The base frequency-domain sequence and the replica frequency-domain sequence may be combined and mapped onto a first RU 996, thereby determining 980 data carried by all data subcarriers in that RU 996.

Further, the data on the first RU 996 may determine the data on the second RU 996 according to the following relationship:

wherein d is _k,1 Indicating the data carried by the kth data subcarrier in the first RU 996,

indicating the data carried by the kth data subcarrier in the second RU 996. Based on the above procedure, data carried by multiple subcarriers in the two RUs 996 corresponding to the 160MHz bandwidth may be determined.

On the other hand, the current standard already supports a 320MHz bandwidth mode, which corresponds to 4 RUs 996 in the 320MHz bandwidth mode, where each RU 996 includes 980 data subcarriers and 16 pilot subcarriers.

In the modulation process, first, 980 bits may be selected from the bit sequence to be modulated, and BPSK constellation point mapping is performed on the selected 980 bits, so as to obtain a frequency domain sequence with a length of 980.

Further, the frequency-domain sequence may be divided into two sub-frequency-domain sequences, each having a length of 490. Each sub-frequency-domain sequence is separately DCM modulated based on the following formula, thereby generating a replica sub-frequency-domain sequence corresponding to the sub-frequency-domain sequence.

d′ _k+490 ＝d _k ×(-1) ^k (5) Wherein d is _k Denotes the kth element, d 'in the sub-frequency domain sequence' _k+490 Representing the replicon frequency domainThe corresponding kth element in the sequence.

A combination of one sub-frequency-domain sequence and a corresponding sub-frequency-domain sequence may be mapped onto data subcarriers in a first RU 996, and another combination of the sub-frequency-domain sequence and a corresponding sub-frequency-domain sequence may be mapped onto data subcarriers in a second RU 996, so that 2 × 980 data carried by all data subcarriers in the two RUs 996 may be determined.

Further, data carried by data subcarriers in the third and fourth RUs 996, 996 may be determined from data carried by data subcarriers in the first and second RUs 996, 996 based on DUP procedures. Specifically, the data in the third RU 996 may be obtained by negating the corresponding data in the first RU 996, and the data in the fourth RU 996 may be obtained by copying the corresponding data in the second RU 996. Based on the above procedure, data carried by data subcarriers in four RUs 996 corresponding to a 320MHz bandwidth may be determined.

In addition, the transmitting device may also determine values carried by the pilot subcarriers in each RU 996, where the values carried by the pilot subcarriers may be used for subsequent channel estimation.

In step 304, the transmitting device changes the phase of the first data carried by the first set of subcarriers by a predetermined angle, the predetermined angle being 90 degrees or minus 90 degrees. Specifically, in order to fully utilize the I-path channel and the Q-path channel in the signal transmission process, the transmitting device may convert the real values carried on part of the subcarriers into the imaginary values. The I path and the Q path are used for transmitting two signals with orthogonal phases, and one of the paths may be used to transfer a real part represented by a complex number, and the other path may be used to transfer an imaginary part represented by a complex number.

In some embodiments, the transmitting device may multiply the value carried on the odd numbered subcarriers by i, i.e. change the phase of the data by 90 degrees; without changing the value carried by the even numbered subcarriers.

Taking the 160MHz bandwidth mode as an example, the transmitting apparatus multiplies the value on the subcarrier with position number 2k +1 (-506 ≦ k ≦ 505) of the subcarrier by i, for example, thereby converting to an imaginary value. Taking the 320MHz bandwidth mode as an example, the transmitting apparatus multiplies the value on the subcarrier with position number 2k +1 (-1018. Ltoreq. K.ltoreq.1017) of the subcarrier by i, for example, thereby converting to an imaginary value.

In some embodiments, the transmitting device may multiply the value of the data carried on the odd numbered subcarriers by-i, i.e., rotate the phase of the value by-90 degrees; without changing the phase of the values carried by the odd numbered sub-carriers.

Taking the 160MHz bandwidth mode as an example, the transmitting apparatus multiplies the value of data on a subcarrier with a position number of 2k +1 (-506 ≦ k ≦ 505) for a subcarrier by-i, for example, thereby converting to an imaginary value. Taking the 320MHz bandwidth mode as an example, the transmitting device multiplies the value of data carried on a subcarrier with position number of 2k +1 (-1018. Ltoreq. K. Ltoreq.1017) of the subcarrier by-i, for example, to convert to an imaginary value.

In some embodiments, the transmitting device may multiply the value of the data carried on the even numbered subcarriers by i, i.e., change the phase of the data by 90 degrees; without changing the value of the data carried by the even numbered subcarriers.

Taking the 160MHz bandwidth mode as an example, the transmitting device multiplies the value of data carried on a subcarrier whose position index of the subcarrier is 2k (-506 ≦ k ≦ 506) by i, for example, thereby converting into an imaginary value. Taking the 320MHz bandwidth mode as an example, the transmitting apparatus multiplies, for example, the value of data carried on a subcarrier whose position number of the subcarrier is 2k (-1018 ≦ k ≦ 1018) by i, thereby converting into an imaginary value.

In some embodiments, the transmitting device may multiply the value of the data carried on the even numbered subcarriers by-i, i.e., rotate the phase of the value by-90 degrees; without changing the phase of the values carried by the odd numbered subcarriers.

Taking the 160MHz bandwidth mode as an example, the transmitting device, for example, multiplies the value of data carried on a subcarrier whose position index of the subcarrier is 2k (-506 ≦ k ≦ 506) by-i, thereby converting into an imaginary value. Taking the 320MHz bandwidth mode as an example, the transmitting apparatus multiplies, for example, the value of data carried on a subcarrier whose position number of the subcarrier is 2k (-1018 ≦ k ≦ 1018) by-i, thereby converting into an imaginary value.

In step 306, the transmitting device generates a modulated signal based on the phase-changed first data carried by the first set of subcarriers and the second data carried by the second set of subcarriers. Specifically, the transmitting device may convert the frequency domain data into time domain data using IDFT, for example, thereby generating a modulated signal.

In some embodiments, a transmitting device transmits a modulated signal to a receiving device to enable transmission of data.

Based on the above discussed process, embodiments of the present disclosure may be able to convert data carried by subcarriers from a single real value to a combination of real and imaginary numbers, which enables signals to fully utilize both I-path and Q-path channels in the transmission process, thereby enhancing the diversity gain of the system. On the other hand, the scheme of the present disclosure does not change the conventional BPSK, DCM and DUP modules, which enables the scheme of the present disclosure to be well adapted to devices based on existing standards.

Furthermore, it can be found through experiments that the embodiments of the present disclosure have almost no effect on the peak-to-average power ratio PAPR distribution. Fig. 4 shows a comparison diagram 400 of cumulative distribution function CDF simulation of PAPR. Specifically, the present disclosure compares PAPR results of a conventional DCM scheme, a DUP scheme, a scheme of the present disclosure and another comparison scheme, taking a DUP mode of 160M as an example. The contrast scheme utilizes both I-path and Q-path channels simultaneously by using rotated BPSK constellation mapping.

Specifically, in the CDF simulation process of fig. 4, the scheme specifically adopted by the present disclosure is to multiply the value on the subcarrier with the technology as the serial number by i. By fully utilizing the I-path channel and the Q-path channel, the scheme of the disclosure can remarkably improve the grading gain of the system. Furthermore, as can be seen from fig. 4, the present disclosure does not reduce the PAPR of the system while improving the classification gain of the system, and its PAPR result is significantly superior to the comparative scheme. Therefore, the scheme of the present disclosure enhances the diversity gain of the system on the basis of guaranteeing the PAPR.

According to an embodiment of the present disclosure, a scheme of demodulating a signal is also provided. Specifically, in the process of demodulating the signal, the receiving device acquires first data carried on a first group of subcarriers and second data carried on a second group of subcarriers of the plurality of subcarriers. Then, the receiving apparatus changes the phase of the first data by a predetermined angle, the predetermined angle being 90 degrees or minus 90 degrees, and then determines a bit sequence based on the phase-changed first data and second data.

A process of demodulating a signal according to an embodiment of the present disclosure will be described below with reference to fig. 5. Fig. 5 shows a flowchart of an example process 500 of demodulating a signal according to an embodiment of the disclosure. It should be understood that process 500 may be performed by a suitable receiving device, examples of which include, but are not limited to, access point AP 110 or station STA120 illustrated in fig. 1.

As shown in fig. 5, in step 502, the receiving device obtains first data carried on a first set of subcarriers and second data carried on a second set of subcarriers of the plurality of subcarriers.

Specifically, the receiving device may receive a signal transmitted by the transmitting device. After performing down-conversion, synchronization, and the like on the signal, the receiving device may utilize Discrete Fourier Transform (DFT) to transform the time domain data to the frequency domain data, thereby obtaining the data carried by each subcarrier.

In step 504, the receiving device changes the phase of the first data by a predetermined angle, the predetermined angle being 90 degrees or minus 90 degrees.

Specifically, the receiving device may perform a corresponding phase change according to the rule of the phase change at the transmitting device side. In some embodiments, the transmitting device may multiply the value carried on the odd numbered sub-carriers by-i, i.e., change the phase of the data by-90 degrees; without changing the value carried by the even numbered subcarriers.

Taking the 160MHz bandwidth mode as an example, the transmitting device multiplies the value on the subcarrier with position number 2k +1 (-506 ≦ k ≦ 505) of the subcarrier by-i, for example. Taking the 320MHz bandwidth mode as an example, the transmitting device multiplies the value on a subcarrier with position number 2k +1 (-1018 ≦ k ≦ 1017) of the subcarrier by-i, for example.

In some embodiments, the transmitting device may multiply the value carried on the odd numbered subcarriers by i, i.e., change the phase of the data by 90 degrees; without changing the value carried by the odd numbered subcarriers.

Taking the 160MHz bandwidth mode as an example, the transmitting device multiplies the value on the subcarrier with position number 2k +1 (-506 ≦ k ≦ 505) of the subcarrier by i, for example. Taking the 320MHz bandwidth mode as an example, the transmitting device multiplies i by the value on the subcarrier with position number 2k +1 (-1018 ≦ k ≦ 1017), for example.

In some embodiments, the transmitting device may multiply the value carried on the even numbered subcarriers by-i, i.e., change the phase of the data by 90 degrees; without changing the value carried by the even numbered subcarriers.

Taking the 160MHz bandwidth mode as an example, the transmitting device multiplies, for example, the value on a subcarrier having a position index of 2k (-506 ≦ k ≦ 506) for the subcarrier by-i. Taking the 320MHz bandwidth mode as an example, the transmitting device multiplies, for example, the value on a subcarrier whose position number of the subcarrier is 2k (-1018 ≦ k ≦ 1018) by-i.

In some embodiments, the transmitting device may multiply the value carried on the even numbered subcarriers by i, i.e., change the phase of the data by 90 degrees; without changing the value carried by the odd numbered sub-carriers.

Taking the 160MHz bandwidth mode as an example, the transmitting device multiplies i by the value on the subcarrier whose position index is 2k (-506 ≦ k ≦ 506), for example. Taking the 320MHz bandwidth mode as an example, the transmitting device multiplies i by the value on a subcarrier with a position index of 2k (-1018 ≦ k ≦ 1018), for example.

In step 506, the receiving device determines a bit sequence based on the second data and the phase-changed first data.

In some implementations, since the transmitting device copies four copies of the data in the modulation process, the receiving device may determine a bit sequence based on one of the copies of the data. For example, taking the 160MHz bandwidth mode as an example, the receiving device may perform BSPK constellation demapping on the phase-recovered values of the 480 data subcarriers in the first RU 996 to determine a bit sequence corresponding to the signal.

In some implementations, the receiving device may also utilize a maximum ratio combining algorithm to determine the bit sequence. Specifically, in 160MHz bandwidth mode, the phase transformed data may be represented as y ₀ ,y ₁ ,y ₂ …y ₁₉₅₉ The receiving device may obtain N according to the following formula _sd Estimation results of the individual constellation points:

wherein i is more than or equal to 0 and less than or equal to N _sd -1,h _i Is a channel estimation result corresponding to the ith subcarrier,

is h _i In the 160MHz bandwidth mode, N _sd ＝490。

For the 320MHz bandwidth mode, the phase transformed data may be represented as y ₀ ,y ₁ ,y ₂ …y ₃₉₁₉ The receiving device may obtain N according to the following formula _sd Estimation results of individual constellation points:

is h _i In the 320MHz bandwidth mode, N _sd ＝980。

Then, the receiving device may calculate an LLR (log-likelihood ratio) of each bit according to the constellation point estimation result, and send the LLR to the channel decoding module for decoding, thereby recovering the obtained bit sequence.

Second implementation of the present disclosure

According to yet another example embodiment of the present disclosure, an improved scheme of modulating and demodulating a signal is provided. Specifically, in the process of modulating the signal, the transmitting device determines at least one first frequency domain sequence corresponding to the bit sequence by using Quadrature Phase Shift Keying (QPSK) constellation point mapping. Then, the transmitting device determines at least one second frequency-domain sequence based on the complex transform of the at least one first frequency-domain sequence, and determines data carried by the plurality of subcarriers using at least one of dual carrier modulation, DCM, and repetition of the DUP based on the at least one first frequency-domain sequence and the at least one second frequency-domain sequence. Further, the transmitting device may generate a modulated signal based on the data carried by the plurality of subcarriers.

A process of modulating a signal according to an embodiment of the present disclosure will be described below with reference to fig. 6. Fig. 6 shows a flow diagram of an example process 600 for modulating a signal according to an embodiment of this disclosure. It should be understood that process 600 may be performed by a suitable transmitting device, examples of which include, but are not limited to, access point AP 110 or station STA120 illustrated in fig. 1.

As shown in fig. 6, the transmitting device determines at least one first frequency domain sequence corresponding to a bit sequence using quadrature phase shift keying, QPSK, constellation point mapping, step 602.

In some implementations, rather than utilizing BPSK constellation point mapping, implementations of the second aspect of the present disclosure may utilize QPSK constellation point mapping to determine a frequency domain sequence corresponding to a bit sequence. Taking the 160MHz bandwidth mode as an example, the bandwidth mode corresponds to 2 RUs 996, where each RU 996 includes 980 data subcarriers and 16 pilot subcarriers. The transmitting device may select 490 bits from the bit sequence to be modulated and perform QPSK constellation point mapping thereon, thereby obtaining a frequency domain sequence of length 245, i.e., a first frequency domain sequence.

For the example of 320MHz bandwidth mode, the transmitting device may select 980 bits from the bit sequence to be modulated and perform QPSK constellation point mapping on it, thereby obtaining a frequency domain sequence of length 450. Further, the sending device may also split the frequency domain sequence with length 450 into 2 frequency domain sequences with length 245, i.e. two first frequency domain sequences.

In step 604, the transmitting device determines at least one second frequency-domain sequence based on a complex transform of the at least one first frequency-domain sequence.

Taking the 160MHz bandwidth mode as an example, the transmitting device may perform a complex transform on symbols in the first frequency-domain sequence of length 245 to generate a second frequency-domain sequence of length 245. In some embodiments, the complex transforms may include one or a combination of conjugate transforms, permutations and negations of the imaginary and real parts.

Taking the 320MHz bandwidth mode as an example, the transmitting device may perform complex transform on two sub-frequency-domain sequences of length 450 (i.e., the first frequency-domain sequence) respectively to obtain corresponding second frequency-domain sequences. In this way, 4 frequency domain sequences of length 245 can be obtained.

In step 606, the transmitting device determines data carried by a plurality of subcarriers using at least one of dual carrier modulation, DCM, and repetition of an operational, DUP, based on the at least one first frequency domain sequence and the at least one second frequency domain sequence.

In some embodiments, the at least one replication process comprises a first replication process that causes values of odd or even positions in the frequency domain sequence to be replicated to be inverted as the replicated frequency domain sequence. Illustratively, the first replication process may be performed by DCM modulation.

In some embodiments, the at least one copying process includes a second copying process that causes values of a first half or a second half of the frequency domain sequence to be copied to be inverted as the copied frequency domain sequence. Illustratively, the second copy process may be performed by repeatedly operating the DUP.

In some embodiments, the transmitting device may perform the first copy process and the second copy process simultaneously. Taking the 160MHz bandwidth mode as an example, the transmitting apparatus may combine the first frequency-domain sequence and the second frequency-domain sequence each having the length 245, and perform DCM modulation on the combined frequency-domain sequence (for convenience of description, referred to as a combined frequency-domain sequence) to obtain a replica frequency-domain sequence. Specifically, the correspondence between the element in the merged frequency domain sequence and the element in the copied frequency domain sequence may be expressed as:

d′ _k+490 ＝d _k ×(-1) ^k (8)

wherein d is _k Denotes the kth element, d' _k+490 Representing the corresponding kth element in the replica frequency domain sequence. The combined frequency-domain sequence and the replica frequency-domain sequence may be combined into a frequency-domain sequence of length 980 (referred to as a third frequency-domain sequence for convenience of description).

Further, the third frequency-domain sequence may generate a fourth frequency-domain sequence of length 980 according to the following relationship:

wherein d is _k,1 Data representing a kth position in a third frequency domain sequence,

data representing the determined kth position in the fourth frequency domain sequence.

Further, the third and fourth frequency-domain sequences may be mapped to data subcarriers in the first and second RUs 996, respectively, to determine the data carried by all of the data subcarriers.

On the other hand, for the example of 320MHz wideband mode, the transmitting device may obtain 2 first frequency-domain sequences of length 245 and corresponding 2 second frequency-domain sequences based on the complex transform, as discussed above. Further, the sending device may combine one first frequency-domain sequence and the corresponding second frequency-domain sequence to obtain a first combined frequency-domain sequence with a length of 490; and combines the other first frequency-domain sequence with the corresponding second frequency-domain sequence to obtain a second combined frequency-domain sequence of length 490.

Further, the transmitting device may generate the corresponding first and second replica frequency-domain sequences by DCM-modulating the first and second combined frequency-domain sequences, respectively, based on the following formula.

d′ _k+490 ＝d _k ×(-1) ^k (10)

Wherein d is _k Denotes the kth element, d' _k+490 Representing the corresponding kth element in the replica frequency domain sequence.

Further, the transmitting device may also process the first combined frequency-domain sequence, the second combined frequency-domain sequence, the first replica frequency-domain sequence, and the second replica frequency-domain sequence, each having a length of 490, based on the DUP procedure. Specifically, the transmitting device may combine the first combined frequency-domain sequence and the first replica frequency-domain sequence into a fifth frequency-domain sequence of length 980, and combine the second combined frequency-domain sequence and the second replica frequency-domain sequence into a sixth frequency-domain sequence of length 980.

Subsequently, based on the DUP procedure, the sending device may invert the value of the fifth frequency-domain sequence to obtain a seventh frequency-domain sequence of length 980; and directly copies the sixth frequency-domain sequence to obtain an eighth frequency-domain sequence of length 980.

Then, a fifth frequency-domain sequence, a sixth frequency-domain sequence, a seventh frequency-domain sequence, and an eighth frequency-domain sequence of length 980 may be mapped onto the data subcarriers in the four RUs 996, respectively, to determine values of the plurality of data subcarriers.

In some embodiments, the transmitting device may perform only one of the first copy process and the second copy process. It should be appreciated that in the case where the replication process is performed only once, the same resources may carry more data. Taking the 160MHz bandwidth as an example, instead of performing the duplication process twice, the transmitting device may obtain a bit sequence of length 980 and convert to a first frequency domain sequence of length 490 via QPSK constellation mapping.

The transmitting device may then perform the complex transform discussed above on the first frequency-domain sequence to determine a length 490 second frequency-domain sequence. Subsequently, the first and second frequency-domain sequences may be combined into a frequency-domain sequence of length 980, and another frequency-domain sequence of length 980 may be generated based on the first or second replication process.

Further, the two frequency domain sequences of length 980 may be mapped onto data subcarriers in 2 RUs 996, thereby determining values carried by the plurality of subcarriers corresponding to the 160MHz bandwidth mode. It should be appreciated that the 320MHz bandwidth mode or other suitable bandwidth mode may similarly perform the duplication process only once.

At step 608, the transmitting device generates a modulated signal based on the data carried by the plurality of subcarriers. Specifically, the transmitting device converts values carried by a plurality of subcarriers to the time domain, for example, by inverse discrete fourier transform, thereby generating a modulated signal. In some embodiments, the transmitting device may also transmit the modulated signal to the receiving device.

Based on the above-discussed method, data will be repeatedly transmitted more times on frequency domain resources than the conventional scheme, thereby being able to significantly improve the hierarchical gain of the system.

Furthermore, it can be found through experimentation that embodiments of the present disclosure have little impact on the peak-to-average power ratio, PAPR, distribution, as compared to the comparative schemes discussed above. Fig. 7 shows a cumulative distribution function CDF simulation of PAPR versus an illustrative graph 700. On one hand, by using QPSK for modulation, the scheme of the present disclosure can significantly improve the resource utilization efficiency of the system and improve the diversity efficiency of the system. Furthermore, as can be seen from fig. 7, the PAPR results of the present disclosure substantially coincide with the comparative scheme while increasing the fractional gain of the system. Therefore, the scheme of the present disclosure enhances the diversity gain of the system on the basis of ensuring the PAPR.

According to an embodiment of the present disclosure, a scheme of demodulating a signal is also provided. Specifically, in the process of demodulating a signal, a receiving device acquires data carried by multiple groups of subcarriers, where the multiple groups of subcarriers include at least four groups of subcarriers used for carrying the same information; and determining a bit sequence by utilizing Quadrature Phase Shift Keying (QPSK) constellation point demapping based on data carried by at least one group of subcarriers in the plurality of groups of subcarriers.

A process of demodulating a signal according to an embodiment of the present disclosure will be described below with reference to fig. 8. Fig. 8 shows a flowchart of an example process 800 of demodulating a signal according to an embodiment of the disclosure. It should be understood that process 800 may be performed by a suitable receiving device, examples of which include, but are not limited to, access point AP 110 or station STA120 illustrated in fig. 1.

As shown in fig. 8, in step 802, the receiving device obtains data carried by multiple groups of subcarriers, where the multiple groups of subcarriers include at least four groups of subcarriers for carrying the same information. Illustratively, the number of groups of subcarrier groups is a multiple of 4.

In particular, the receiving device may receive a signal from the transmitting device. After receiving the signal, the receiving device may perform down-conversion, synchronization, and the like, and transform the time domain data to the frequency domain data through Discrete Fourier Transform (DFT), thereby obtaining data carried by each subcarrier. Accordingly, the subcarriers may be divided into a plurality of groups according to sequences, respectively, according to the manner in which the signal is modulated. Taking the example of the transmitting device modulating by QPSK in combination with DCM and DUP, the receiving device can acquire the data carried by the eight groups of subcarriers. Conversely, when the transmitting device is modulated by QPSK in combination with DCM or DUP, the data will be copied four times in the frequency domain. Accordingly, the transmitting device may acquire the data carried by the four groups of subcarriers.

At step 804, the receiving device determines a bit sequence corresponding to the received signal using quadrature phase shift keying, QPSK, constellation point demapping based on data carried by at least one of the groups of subcarriers.

Continuing with the example of a transmitting device using QPSK in combination with DCM and DUP for modulation, after using QPSK constellation mapping and using DCM modulation and DUP for assignment, the data will be replicated eight times in the frequency domain and correspond to eight different sets of subcarriers. In some embodiments, the receiving device may determine the bit sequence based on a quantum of data therein. Taking a 160MHz bandwidth mode as an example, a first group of subcarriers of the eight groups of subcarriers carries a first frequency domain sequence corresponding to an original bit sequence, a second group of subcarriers carries a second frequency domain sequence obtained by complex transformation, a third group of subcarriers carries a third frequency domain sequence obtained by DCM modulation of the first frequency domain sequence, a fourth group of subcarriers carries a fourth frequency domain sequence obtained by DCM of the second frequency domain sequence, a fifth group of subcarriers carries a fifth frequency domain sequence obtained by inverting the first frequency domain sequence, a sixth frequency domain sequence obtained by inverting the second frequency domain sequence is carried by the sixth group of subcarriers, a seventh frequency domain sequence obtained by replicating the third frequency domain sequence is carried by the seventh group of subcarriers, and an eighth frequency domain sequence obtained by replicating the fourth frequency domain sequence is carried by the eighth group of subcarriers. Accordingly, the receiving device may, for example, perform QPSK constellation demapping on the first frequency domain sequence to obtain a corresponding bit sequence.

In some implementations, the receiving device may also utilize a maximum bit combining algorithm to determine the bit sequence. Accordingly, the receiving device can perform the inverse complex transform corresponding to the complex transform employed in the modulation stage on the subcarriers of the predetermined group of the eight groups of subcarriers.

Taking the 160MHz bandwidth mode as an example, the receiving device may perform a complex inverse transform on the second frequency-domain sequence carried by the second group of subcarriers, the fourth frequency-domain sequence carried by the fourth group of subcarriers, the sixth frequency-domain sequence carried by the sixth group of subcarriers, and the eighth frequency-domain sequence carried by the eighth group of subcarriers. In some embodiments, the inverse complex transform may comprise one or a combination of conjugate transforms, permutations and negations of imaginary and real parts.

The inverse transformed data may be represented as y ₀ ,y ₁ ,y ₂ …y ₁₉₅₉ . Further, in the 160MHz bandwidth mode, the receiving device may obtain N according to the following formula _sd Estimation results of individual constellation points:

is h _i In the 160MHz bandwidth mode, N _sd ＝245。

Then, the receiving device may calculate an LLR for each bit according to the constellation point estimation result, and send the LLR to the channel decoding module for decoding, thereby recovering the bit sequence.

For the 320MHz bandwidth mode, similarly, the receiving device may first perform inverse complex transform on the data carried on the predetermined subcarrier, and recover the data with reversed symbols during DCM coding and DUP copying at the same time, to obtain recovered data y ₀ ,y ₁ ,y ₂ …y ₃₉₁₉ . Further, the receiving device may determine N according to the following formula _sd Estimation results of individual constellation points:

wherein i is more than or equal to 0 and less than or equal to N _sd -1,h _i(n) Is a result of channel estimation corresponding to the ith (n) th subcarrier,

is h _i(n) I (n) = i + nN _sd In 320MHz bandwidth mode, N _sd ＝490。

It will be appreciated that when the transmitting device performs modulation by QPSK in combination with DCM or DUP, the transmitting device may recover the bit sequence based on a similar procedure to recover the data carried by the four groups of subcarriers.

Example apparatus and devices

Fig. 9 illustrates a schematic block diagram of a transmitting device 900 in accordance with some embodiments of the present disclosure. As shown in fig. 9, the transmitting device 900 includes: a carrier modulation module 910 configured to modulate a bit sequence onto a plurality of subcarriers, the plurality of subcarriers including a first set of subcarriers and a second set of subcarriers, using Binary Phase Shift Keying (BPSK) constellation point mapping, dual Carrier Modulation (DCM), and repetition of the DUP; a phase adjustment module 920 configured to change a phase of first data carried by the first group of subcarriers by a predetermined angle, the predetermined angle being 90 degrees or minus 90 degrees; and a first signal generation module 930 configured to generate a modulated signal based on the phase-changed first data carried by the first set of subcarriers and the second data carried by the second set of subcarriers.

It should be understood that the corresponding modules in the transmitting device 900 may also be used for implementing other processes or steps of modulating signals discussed in the above first implementation, and specific details may be referred to the above related description and will not be described in detail here.

Fig. 10 shows a schematic block diagram of a receiving device 1000 according to some embodiments of the present disclosure. As shown in fig. 10, the receiving apparatus 1000 includes: a first data acquisition module 1010 configured to determine first data carried on a first set of subcarriers of a plurality of subcarriers and second data carried on a second set of subcarriers; a phase inversion adjustment module 1020 configured to change a phase of the first data by a predetermined angle, the predetermined angle being 90 degrees or minus 90 degrees; and a first sequence determining module 1030 configured to determine a bit sequence based on the phase-changed first data and second data.

It should be understood that the corresponding modules in the receiving device 1000 may also be used for implementing other processes or steps of demodulating signals discussed in the above first implementation, and specific details may be referred to the above related description and will not be described in detail herein.

Fig. 11 shows a schematic block diagram of a transmitting device 1100 according to some embodiments of the present disclosure. As shown in fig. 11, the transmission apparatus 1100 includes: a QPSK mapping module 1210 configured to determine at least one first frequency domain sequence corresponding to a bit sequence using quadrature phase shift keying, QPSK constellation point mapping; a transform module 1220 configured to determine at least one second frequency-domain sequence based on a complex transform of the at least one first frequency-domain sequence; a replication module 1230 configured to determine data carried by the plurality of subcarriers based on the at least one first frequency-domain sequence and the at least one second frequency-domain sequence with at least one of dual carrier modulation, DCM, and repetition operation, DUP; and a second signal generation module 1240 configured to generate a modulated signal based on the data carried by the plurality of subcarriers.

It should be understood that the corresponding modules in the transmitting device 1100 may also be used for implementing other processes or steps of modulating signals discussed in the second implementation above, and specific details may be referred to the above related description and will not be described in detail here.

Fig. 12 shows a schematic block diagram of a receiving device 1200 according to some embodiments of the present disclosure. As shown in fig. 10, the reception apparatus 1200 includes: a second data obtaining module 1210 configured to obtain data carried by multiple groups of subcarriers, where the multiple groups of subcarriers are used for carrying the same information; and a second sequence determination module 1220 configured to determine a bit sequence using quadrature phase shift keying, QPSK, constellation point demapping based on data carried by at least one of the plurality of sets of subcarriers.

It should be understood that the corresponding modules in the receiving device 1200 may also be used for implementing other processes or steps of demodulating signals discussed in the second implementation above, and specific details may be referred to the above related description and will not be described in detail herein.

It should be appreciated that the transmitting device 900/1100 and/or receiving device 1000/1200 discussed above may be implemented using application specific integrated circuits, one or more FPGAs (field programmable gate arrays), PLDs (programmable logic devices), controllers, state machines, gate logic, discrete hardware components, any other suitable circuitry, or any combination of circuitry capable of performing the various processes of the present disclosure, a chip, a board, or a communications device, etc.

Fig. 13 is a simplified block diagram of an example device 1300 suitable for implementing embodiments of the present disclosure. The device 1300 may be a receiving device and/or a transmitting device, or a chip therein, implementing the present disclosure. As shown, the device 1300 includes one or more processors 1310, and optionally, a transceiver 1340 coupled to the processors 1310;

optionally, the first device 1300 further includes a memory 1320 coupled to the processor 1310, where the memory 1320 is configured to store instructions executed by the processor, and when the instructions are executed by the processor, the processor can implement the functions of the units in fig. 9 to 12, and specific details may be cited above, and are not described herein again.

The processor 1310 is mainly used for processing a communication protocol and communication data, controlling the entire communication apparatus, executing a software program, and processing data of the software program. The memory 1320 is primarily used to store software programs and data. The transceiver 1340 may include a control circuit and an antenna, the control circuit being mainly used for conversion of baseband signals and radio frequency signals and processing of radio frequency signals. The antenna is mainly used for receiving and transmitting radio frequency signals in the form of electromagnetic waves. Input and output devices, such as touch screens, display screens, keyboards, etc., are used primarily for receiving data input by a user and for outputting data to the user.

When the device 1300 is powered on, the processor 1310 can read the software program from the memory 1320, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be sent wirelessly, the processor 1310 performs baseband processing on the data to be sent, and outputs a baseband signal to the radio frequency circuit, and the radio frequency circuit performs radio frequency processing on the baseband signal and then sends the radio frequency signal to the outside in the form of electromagnetic waves through the antenna. When there is data to be transmitted to the device 1300, the rf circuit receives an rf signal through the antenna, converts the rf signal into a baseband signal, and outputs the baseband signal to the processor 1310, and the processor 1310 converts the baseband signal into data and processes the data.

The rf circuitry and antenna may be provided independently of the processor performing the baseband processing, for example in a distributed scenario, the rf circuitry and antenna may be in a remote arrangement independent of the communication device.

The transceiver 1340 may be used for two-way communication. Processor 1340 may have at least one communication interface for communicating. The communication interface may include any interface necessary to communicate with other devices.

The processor 1310 may be of any type suitable to a local technology network, and may include, but is not limited to, one or more of general purpose computers, special purpose computers, microcontrollers, digital signal controllers (DSPs), and controller-based multi-core controller architectures. The device 1300 may have multiple processors, such as application specific integrated circuit chips, that are time-dependent from a clock synchronized to the main processor.

The memory 1320 may include one or more non-volatile memories and/or one or more volatile memories. Examples of non-volatile memory include, but are not limited to, read Only Memory (ROM) 1324, erasable Programmable Read Only Memory (EPROM), flash memory, a hard disk, a Compact Disk (CD), a Digital Video Disk (DVD), and other magnetic and/or optical storage. Examples of volatile memory include, but are not limited to, random Access Memory (RAM) 1322 and other volatile memory that does not persist for the duration of the power down.

Computer programs 1330 include computer-executable instructions that are executed by associated processor 1310. The program 1330 may be stored in the ROM 1320. Processor 1310 may perform any suitable actions and processes by loading program 1330 into RAM 1320.

Embodiments of the present disclosure may be implemented by way of program 1330 such that apparatus 1300 may perform any of the processes as discussed with reference to fig. 2-6. Embodiments of the present disclosure may also be implemented by hardware or by a combination of software and hardware.

In some embodiments, program 1330 may be tangibly embodied in a computer-readable medium, which may be included in device 1300 (such as in memory 1320) or other storage device accessible by device 1300. Program 1330 may be loaded from a computer-readable medium into RAM 1322 for execution. The computer readable medium may include any type of tangible, non-volatile memory, such as ROM, EPROM, flash memory, a hard disk, a CD, a DVD, etc.

In general, the various embodiments of the disclosure may be implemented in hardware or special purpose circuits, software, logic or any combination thereof. Some aspects may be implemented in hardware, while other aspects may be implemented in firmware or software, which may be executed by a controller, microprocessor or other computing device. While various aspects of the embodiments of the disclosure are illustrated and described as block diagrams, flow charts, or using some other pictorial representation, it is well understood that the blocks, apparatus, systems, techniques or methods described herein may be implemented in, as non-limiting examples, hardware, software, firmware, special purpose circuits or logic, general purpose hardware or controller or other computing devices, or some combination thereof.

The present disclosure also provides at least one computer program product tangibly stored on a non-transitory computer-readable storage medium. The computer program product comprises computer executable instructions, such as instructions included in program modules, that are executed in a device on a target real or virtual processor to perform the processes/methods as described above. Generally, program modules include routines, programs, libraries, objects, classes, components, data structures, etc. that perform particular tasks or implement particular abstract data types. In various embodiments, the functionality of the program modules may be combined or split between program modules as desired. Machine-executable instructions for program modules may be executed within local or distributed devices. In a distributed facility, program modules may be located in both local and remote memory storage media.

Computer program code for implementing the methods of the present disclosure may be written in one or more programming languages. These computer program code may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the program code, when executed by the computer or other programmable data processing apparatus, causes the functions/acts specified in the flowchart and/or block diagram to be performed. The program code may execute entirely on the computer, partly on the computer, as a stand-alone software package, partly on the computer and partly on a remote computer or entirely on the remote computer or server.

In the context of the present disclosure, computer program code or related data may be carried by any suitable carrier to enable a device, apparatus or processor to perform various processes and operations described above. Examples of a carrier include a signal, computer readable medium, and the like. Examples of signals may include electrical, optical, radio, acoustic, or other forms of propagated signals, such as carrier waves, infrared signals, and the like.

The computer readable medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable medium may include, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination thereof. More detailed examples of a computer-readable storage medium include an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical storage device, a magnetic storage device, or any suitable combination thereof.

Further, while the operations of the methods of the present disclosure are depicted in the drawings in a particular order, this does not require or imply that these operations must be performed in this particular order, or that all of the illustrated operations must be performed, to achieve desirable results. Rather, the steps depicted in the flowcharts may change the order of execution. Additionally or alternatively, certain steps may be omitted, multiple steps combined into one step execution, and/or one step broken down into multiple step executions. It should also be noted that features and functions of two or more devices according to the present disclosure may be embodied in one device. Conversely, the features and functions of one apparatus described above may be further divided into embodiments by a plurality of apparatuses.

The foregoing has described implementations of the present disclosure, and the above description is illustrative, not exhaustive, and is not limited to the disclosed implementations. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described implementations. The terminology used herein was chosen in order to best explain the principles of various implementations, the practical application, or improvements made to the technology in the marketplace, or to enable others of ordinary skill in the art to understand various implementations disclosed herein.

Claims

1. A method of modulating a signal, comprising:

modulating a bit sequence onto a plurality of subcarriers using Binary Phase Shift Keying (BPSK) constellation point mapping, binary carrier modulation (DCM), and repeated operation (DUP), the plurality of subcarriers comprising a first group of subcarriers and a second group of subcarriers;

changing the phase of first data carried by the first group of subcarriers by a predetermined angle, the predetermined angle being 90 degrees or minus 90 degrees; and

generating a modulated signal based on the phase-altered first data carried by the first set of subcarriers and the second data carried by the second set of subcarriers.

2. The method of claim 1, wherein the first group of subcarriers comprises odd numbered subcarriers of the plurality of subcarriers and the second group of subcarriers comprises even numbered subcarriers of the plurality of subcarriers.

3. The method of claim 1, wherein the first group of subcarriers comprises even numbered subcarriers of the plurality of subcarriers and the second group of subcarriers comprises odd numbered subcarriers of the plurality of subcarriers.

4. A method of modulating a signal, comprising:

determining at least one first frequency domain sequence corresponding to the bit sequence by utilizing quadrature phase shift keying QPSK constellation point mapping;

determining at least one second frequency-domain sequence based on a complex transform of the at least one first frequency-domain sequence;

determining data carried by a plurality of subcarriers using at least one replication process based on the at least one first frequency-domain sequence and the at least one second frequency-domain sequence; and

generating a modulated signal based on the data carried by the plurality of subcarriers.

5. The method of claim 4, wherein the complex transformation comprises at least one of:

conjugate transformation;

exchanging the imaginary part and the real part; or

And (6) performing inversion operation.

6. The method of claim 4, wherein the at least one copy process comprises a first copy process that causes values of odd or even positions in a frequency domain sequence to be copied to be inverted as a copied frequency domain sequence.

7. The method of claim 4, wherein the at least one copying process includes a second copying process that causes values of a first half or a second half of the frequency-domain sequence to be copied to be inverted as the copied frequency-domain sequence.

8. A method of demodulating a signal, comprising:

acquiring first data carried on a first group of subcarriers and second data carried on a second group of subcarriers in a plurality of subcarriers;

changing the phase of the first data by a predetermined angle, the predetermined angle being 90 degrees or minus 90 degrees; and

determining a bit sequence based on the first data and the second data with the changed phase.

9. The method of claim 8, wherein the first set of subcarriers comprises odd numbered subcarriers of the plurality of subcarriers and the second set of subcarriers comprises even numbered subcarriers of the plurality of subcarriers.

10. The method of claim 8, wherein the first set of subcarriers comprises even numbered subcarriers of the plurality of subcarriers and the second set of subcarriers comprises odd numbered subcarriers of the plurality of subcarriers.

11. A method of demodulating a signal, comprising:

acquiring data carried by a plurality of groups of subcarriers, wherein the plurality of groups of subcarriers comprise at least four groups of subcarriers used for carrying the same information; and

determining a bit sequence using quadrature phase shift keying, QPSK, constellation point demapping based on data carried by at least one of the plurality of sets of subcarriers.

12. The method of claim 11, wherein determining a bit sequence corresponding to the received signal using Quadrature Phase Shift Keying (QPSK) constellation point demapping comprises:

performing a complex transformation on data carried by the at least one set of subcarriers;

determining an intermediate sequence corresponding to the complex transformed data by performing QPSK constellation point demapping on the complex transformed data; and

determining the bit sequence based on at least the intermediate sequence.

13. The method of claim 12, wherein the inverse complex transform comprises at least one of:

conjugate transformation;

exchanging the imaginary part and the real part; or

And (6) performing inversion operation.

14. A transmitting device, comprising:

a carrier modulation module configured to modulate a bit sequence onto a plurality of subcarriers, the plurality of subcarriers comprising a first set of subcarriers and a second set of subcarriers, using Binary Phase Shift Keying (BPSK) constellation point mapping, binary carrier modulation (DCM), and a repetition operation (DUP);

a phase adjustment module configured to change a phase of first data carried by the first group of subcarriers by a predetermined angle, the predetermined angle being 90 degrees or minus 90 degrees; and

a first signal generation module configured to generate a modulated signal based on the phase-altered first data carried by the first set of subcarriers and the second data carried by the second set of subcarriers.

15. The transmitting apparatus of claim 14, wherein the first group of subcarriers comprises odd numbered subcarriers among the plurality of subcarriers, and the second group of subcarriers comprises even numbered subcarriers among the plurality of subcarriers.

16. The transmitting apparatus of claim 14, wherein the first group of subcarriers comprises even numbered subcarriers among the plurality of subcarriers, and the second group of subcarriers comprises odd numbered subcarriers among the plurality of subcarriers.

17. A transmitting device, comprising:

a QPSK mapping module configured to determine at least one first frequency domain sequence corresponding to the bit sequence using Quadrature Phase Shift Keying (QPSK) constellation point mapping;

a transform module configured to determine at least one second frequency-domain sequence based on a complex transform of the at least one first frequency-domain sequence;

a replication module configured to determine data carried by a plurality of subcarriers using at least one of at least one replication process based on the at least one first frequency-domain sequence and the at least one second frequency-domain sequence; and

a second signal generation module configured to generate a modulated signal based on the data carried by the plurality of subcarriers.

18. The transmitting device of claim 17, wherein the complex transformation comprises at least one of:

conjugate transformation;

exchanging the imaginary part and the real part; or

And (6) performing inversion operation.

19. The transmitting apparatus of claim 17, wherein the at least one copy process comprises a first copy process that causes values of odd or even positions in a frequency domain sequence to be copied to be inverted as a copied frequency domain sequence.

20. The transmission apparatus according to claim 17, wherein the at least one copy process includes a second copy process that causes a value of a first half or a second half of the frequency domain sequence to be copied to be inverted as the copied frequency domain sequence.

21. A receiving device, comprising:

a first data acquisition module configured to determine first data carried on a first set of subcarriers and second data carried on a second set of subcarriers of a plurality of subcarriers;

a phase inversion adjustment module configured to change a phase of the first data by a predetermined angle, the predetermined angle being 90 degrees or minus 90 degrees; and

a first sequence determination module configured to determine a bit sequence based on the first data and the second data that are phase-changed.

22. The receiving device of claim 21, wherein the first group of subcarriers comprises odd numbered subcarriers of the plurality of subcarriers and the second group of subcarriers comprises even numbered subcarriers of the plurality of subcarriers.

23. The receiving device of claim 21, wherein the first group of subcarriers comprises even numbered subcarriers of the plurality of subcarriers and the second group of subcarriers comprises odd numbered subcarriers of the plurality of subcarriers.

24. A receiving device, comprising:

a second data acquisition module configured to acquire data carried by a plurality of groups of subcarriers, the plurality of groups of subcarriers including at least four groups of subcarriers for carrying the same information; and

a second sequence determination module configured to determine a bit sequence using quadrature phase shift keying, QPSK, constellation point demapping based on data carried by at least one of the plurality of sets of subcarriers.

25. The receiving device of claim 24, wherein the second sequence determination module is further configured to:

determining the bit sequence based at least on the intermediate sequence.

26. The receiving device of claim 25, wherein the inverse complex transform comprises at least one of:

conjugate transformation;

exchanging the imaginary part and the real part; or

And (6) performing inversion operation.

27. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the method according to any one of claims 1-13.

28. A computer program product comprising computer executable instructions, wherein the computer executable instructions, when executed by a processor, implement the method of any one of claims 1-13.